That would depend on the game. Most US games allow a max of 1-1/8; however several International ones do not - FITASC is a 1oz max; International trap is 24 gms (almost 7/8).
I agree when there is money on the line, use the max - if the recoil does not interfere with your second shot. But for cheap and easy practice, using 3/4 or 7/8 12 gauge reloads saves money and your shoulder from the cumulative effects of recoil over the long term
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